Display screen or portion thereof with a transitional graphical user interface



FIG. 1 is a face view of a display screen or portion thereof with atransitional graphical user interface, showing my new design, accordingto a first embodiment and illustrating a first image thereof.

FIG. 2 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a second image thereof.

FIG. 3 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a third image thereof.

FIG. 4 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a fourth image thereof.

FIG. 5 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a fifth image thereof.

FIG. 6 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a sixth image thereof.

FIG. 7 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a seventh image thereof.

FIG. 8 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating an eighth image thereof.

FIG. 9 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a ninth image thereof.

FIG. 10 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating a tenth image thereof.

FIG. 11 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the first embodimentand illustrating an eleventh image thereof.

FIG. 12 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to a second embodimentand illustrating a first image thereof.

FIG. 13 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a second image thereof.

FIG. 14 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a third image thereof.

FIG. 15 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a fourth image thereof.

FIG. 16 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a fifth image thereof.

FIG. 17 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a sixth image thereof.

FIG. 18 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a seventh image thereof.

FIG. 19 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating an eighth image thereof.

FIG. 20 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a ninth image thereof; and,

FIG. 21 is a face view of a display screen or portion thereof with atransitional graphical user interface, according to the secondembodiment and illustrating a tenth image thereof.

The appearance of the transitional icon in the graphical user interfacesequentially transitions among the images shown in FIGS. 1-11 or amongthe images shown in FIGS. 12-21. The process or period in which anyimage transitions to another image forms no part of the claimed design.

The broken lines represent portions of the display screen and graphicaluser interface and form no part of the claimed design.

CLAIM The ornamental design for a display screen or portion thereof witha transitional graphical user interface, as shown and described.